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36 of 143 Items
  • Sale
    Mil-spec 6-Position AR-15 Buffer Tube Mil-spec 6-Position AR-15 Buffer Tube 2 Mil-spec 6-Position AR-15 Buffer Tube 3

    Mil-spec 6-Position AR-15 Buffer Tube

    If you're building your own AR rifle, your stock, brace, or whatever you plan on having on its rear end has to mount on somehow. You'll need a buffer tube. This is a standard mil-spec buffer tube and is compatible with all the common calibers and...

    Was: $17.99
    Now: $13.99
  • Sale
    PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit 1 PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit 2 PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit 3 PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit 4 PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit 5

    PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit

    Why waste time choosing each part for your AR9's lower? This lower build kit includes all the parts you need to assemble your fabricated AR9 80% lower or retail-bought 9mm stripped lower. Note: Due to ATF rule 2021R-08F, any pistol with a stabilizing...

    Was: $299.99
    Now: $189.99
  • Sale
    Spike's Tactical - AR-308 Lower Parts Kit

    Spike's Tactical - AR-308 Lower Parts Kit

    The Spike's Tactical AR-308 Lower Parts Kit sports military-grade hardware (minus that third safety position) with a great fit and finish. This kit is compatible with both retail-bought .308 stripped lowers, and .308 80% lower receivers. What's...

    Was: $64.80
    Now: $59.99
  • Sale
    Bravo Company AR-15 Trigger Assembly - PNT, Nickel

    Bravo Company AR-15 Trigger Assembly - PNT, Nickel

    It's time to get serious about your AR's trigger. Two words: Bravo Company. And this is their PNT Trigger Assembly. Sure it's been given a nickel finish, but that's not all. The interacting surfaces of its individual parts have also been coated in PNT,...

    Was: $69.95
    Now: $65.99
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    Magpul PRS® GEN3 Precision-Adjustable Stock

    Magpul® PRS® GEN3 Precision-Adjustable Stock

    The Magpul PRS GEN3 Precision-Adjustable Stock is the ultimate shoulder rest for enhanced AR accuracy. With a built-in cheek riser, adjustable rubber pad for recoil mitigation, precision adjustment knobs, and mil-spec tube fitment, the PRS GEN3 allows...

    Was: $242.20
    Now: $229.99
  • Sale
    Magpul RSA® QD - Rail Sling Attachment QD Magpul RSA® QD - Rail Sling Attachment QD 2 Magpul RSA® QD - Rail Sling Attachment QD 3 Magpul RSA® QD - Rail Sling Attachment QD 4 Magpul RSA® QD - Rail Sling Attachment QD 5

    Magpul® RSA® QD - Rail Sling Attachment QD

    The Magpul RSA QD is a low profile, two point sling positioned at an angle for maximum comfort and easy accessibility to the push-button. The RSA QD provides a forward attachment point compatible with other QD swivel system slings and the Magpul MS4...

    Was: $29.99
    Now: $22.97
  • Sale
    Fortis Manufacturing, Inc. RED 5.56 Muzzle Brake Fortis Manufacturing, Inc. RED 5.56 Muzzle Brake Fortis Manufacturing, Inc. RED 5.56 Muzzle Brake

    Fortis Manufacturing Inc. RED 5.56 Muzzle Brake

    If you frequently put many rounds downrange with your .223/5.56 AR in rapid succession, you need to squeeze as much control out of your rifle as possible. One way to do this is to replace your mil-spec A2 flash hider with a muzzle brake. For exactly this...

    Was: $79.99
    Now: $69.97
  • Sale
    AR-10/.308 Forged Stripped Upper Receiver - Anodized AR-10/.308 Forged Stripped Upper Receiver - Anodized AR-10/.308 Forged Stripped Upper Receiver - Anodized

    AR-10/.308 Forged Stripped Upper Receiver

    Finished up your 80% lower or stripped lower and want to assemble your own upper receiver piece by piece? Start with quality: Grab one of our forged, mil-spec (7075-T6) "Flattop" stripped AR10 upper receivers. This M4-type upper features a standard...

    Was: $99.99
    Now: $94.99
  • Sale
    Phase 5 Weapon Systems 5/8 x 24 RH FATman Hex Brake Phase 5 Weapon Systems 5/8 x 24 RH FATman Hex Brake

    Phase 5 Weapon Systems 5/8 x 24 RH FATman Hex Brake

    If you're someone who does a lot of high-performance shooting, then you want to cut down on the recoil as much as possible while still maintaining a level barrel and thus your accuracy. The people at Phase 5 Weapon Systems know this full well. That's why...

    Was: $119.99
    Now: $104.97
  • Sale
    Aero Precision Delta 556 Muzzle Brake Aero Precision Delta 556 Muzzle Brake Aero Precision Delta 556 Muzzle Brake

    Aero Precision Delta 556 Muzzle Brake

    On the spectrum from low recoil to less muzzle rise to less concussive blast and flash, you've decided your AR's recoil was manageable how it is. You've decided now to take the edge off the explosion you hear each time you send a round downrange. The...

    Was: $59.99
    Now: $49.97
  • Sale
    Spike's Tactical R2 5.56 Muzzle Brake Spike's Tactical R2 5.56 Muzzle Brake Spike's Tactical R2 5.56 Muzzle Brake

    Spike's Tactical R2 5.56 Muzzle Brake

    Spike's Tactical gets it when it comes to reducing felt recoil for your AR-15. Sure the AR might not kick a lot to begin with, but for you that have AR pistols and generally shorter-barreled builds, the R2 from Spike's Tactical will work wonders. The R2...

    Was: $59.99
    Now: $49.97
  • Sale
    Blue Force Gear Vickers Sling - 2-Point Combat Sling 1 Blue Force Gear Vickers Sling - 2-Point Combat Sling 2 Blue Force Gear Vickers Sling - 2-Point Combat Sling 3 Blue Force Gear Vickers Sling - 2-Point Combat Sling 4 Blue Force Gear Vickers Sling - 2-Point Combat Sling 5

    Blue Force Gear Vickers Sling - 2-Point Combat Sling

    The famous Vickers Sling. Favored by military everywhere. The Patented Vickers Combat Applications Sling™ has revolutionized the way we carry automatic rifles. Developed with industry friend, expert, and former 1st SFOD-Delta operational member...

    Was: $59.95
    Now: $52.97
  • Mil-Spec AR15 Lower Parts Kit (w/ Hammer and Trigger)

    Mil-Spec AR15 Lower Parts Kit (w/ Hammer and Trigger)

    Want an AR-15 trigger that suffers no creep, take-up, or over-travel? Looking for the easiest-to-install LPK? How about the most affordable parts kit possible? This mil-spec AR-15 LPK comes in at a great price with machining and performance that feels...

    $39.99
  • Adjustable Carbine Stock & Buffer Tube Assembly Adjustable Carbine Stock & Buffer Tube Assembly Adjustable Carbine Stock & Buffer Tube Assembly Adjustable Carbine Stock & Buffer Tube Assembly

    Adjustable Carbine Stock & Buffer Tube Assembly

    Whether you bought stripped lower, or just finished an 80% lower, you'll need two components to assemble it and make it functional: A lower parts kit, and a buffer tube assembly like this one. Buffer tube assemblies work with your lower parts kit,...

    $39.99
  • mil-spec-ar-15-buffer-tube-assembly-1

    Mil-spec AR-15 Buffer Tube Assembly

    This stock-less Buffer Tube Assembly is perfect if you're completing an AR pistol, or if you bought a custom or upgraded stock for your rifle build. This kit includes all other buffer components needed to work with your lower parts kit and upper assembly...

    $29.99
  • AR15 LPK Missing Parts Kit

    AR15 LPK Missing Parts Kit

    This AR15 LPK Missing Parts Kit has all the essentials for any lost parts, replacement parts, or for your next custom build. All parts are proudly made in the USA. This LPK Missing Parts Kit comes with: (1) buffer retainer (1) buffer retainer spring (1)...

    $11.99
  • LR-308/AR-10 Lower Parts Kit (w/ Hammer and Trigger)

    LR-308/AR-10 Lower Parts Kit (w/ Hammer and Trigger)

    We strive to provide accurate photographs of our product. Due to parts availability, this kit's trigger and hammer may come in stainless or black. Want an LR-308 trigger that suffers no creep, take-up, or over-travel? Looking for the easiest-to-install...

    $49.99
  • D&H AR/M4 5.56/223 30rd Aluminum Magazine - Black D&H AR/M4 5.56/223 30rd Aluminum Magazine - Black 2 D&H AR/M4 5.56/223 30rd Aluminum Magazine - Black 3 D&H AR/M4 5.56/223 30rd Aluminum Magazine - Black 4

    D&H AR/M4 5.56/223 30rd Aluminum Magazine

    D&H brings you a classic look with new and improved features. Made from heat treated aircraft aluminum coated in Teflon, these rugged AR15 magazines are built to last and are protected from corrosion and are designed to hold both .223 and 5.56...

    $12.99
  • Mil-spec AR-15 Charging Handle 1 Mil-spec AR-15 Charging Handle 2 Mil-spec AR-15 Charging Handle 3

    Mil-spec AR-15 Charging Handle

    This mil-spec AR-15 charging handle will complete any mil-spec standard-sized AR-15 rifle build. It's black and made from 6061 T6 billet aluminum. Features: Made from 6061 T6 billet aluminum Mil-spec dimensions For use with standard-sized AR-15...

    $11.99
  • Premium AR-15 Lower Parts Kit 1 Premium AR-15 Lower Parts Kit 2 Premium AR-15 Lower Parts Kit 3 Premium AR-15 Lower Parts Kit 4

    Premium AR-15 Lower Parts Kit

    A lower parts kit is essential to finishing your AR-type 80% lower or FFL-bought stripped lower receiver. This upgraded LPK maintains mil-spec fitment, but it also comes with a MagPul pistol grip and Magpul MOE trigger guard. This Lower Parts Kit...

    $64.99
  • mil-spec-ar-15-butt-stock-1

    Mil-spec AR-15 Butt Stock

    The original M4-type buttstock. Aftermarket stocks are awesome, but some builders prefer the good ole' mil-spec stuff. This M4 six-position buttstock perfectly replicates the stock found on service-issued rifles. It's made from the same injection-molded...

    $13.99
  • ar-15-fully-stripped-upper-receiver-1 ar-15-fully-stripped-upper-receiver-2 ar-15-fully-stripped-upper-receiver-3 ar-15-fully-stripped-upper-receiver-4 ar-15-fully-stripped-upper-receiver-5

    AR-15 Forged Stripped Upper Receiver

    Ready to piece together your own AR? Finished up your 80% lower or stripped lower and want to assemble your own upper receiver piece by piece? Start with quality: Grab one of our forged, mil-spec (7075-T6) "Flattop" stripped AR-15 upper receivers. This...

    $57.99
  • AR15 LPK - Basic Build Kit

    AR15 LPK - Basic Build Kit

    The Kak Industry AR15 Lower Parts Kit comes with all of the basic essentials you'll need for your own custom AR15 build. This build kit includes the following: bolt catch kit magazine catch kit hammer & trigger pins pivot pin & detent &...

    $27.99
  • Magpul® Angled Foregrip - M-Lok

    Magpul® Angled Foregrip - M-Lok

    This MagPul M-Lok Angled Foregrip is a great addition to any AR-15 or M16 weapon. This AFG (Angled Foregrip) looks sleek compared to other handle options. Weighing in at just 1.2oz, including hardware, this grip is ideal for any and everyone. MagPul is a...

    $25.60
  • Rise Armament RA-140 Super Sporting Drop-In Trigger Rise Armament RA-140 Super Sporting Drop-In Trigger

    Rise Armament RA-140 Super Sporting Drop-In Trigger

    The Affordable, Must-Have Trigger Most factory AR triggers are alright. They get the job done. Sort of. If you’re reading this, then your trigger probably feels gritty, sticky, and inconsistent and for a rifle that should punch out to over 400...

    $129.99
  • UTG Ultra Slim Angled M-LOK Foregrip UTG Ultra Slim Angled M-LOK Foregrip UTG Ultra Slim Angled M-LOK Foregrip UTG Ultra Slim Angled M-LOK Foregrip UTG Ultra Slim Angled M-LOK Foregrip

    UTG Ultra Slim Angled M-LOK Foregrip, Matte Black

    This Ultra Slim Angled MLOK Foregrip from UTG is constructed from 6061-T6 Aluminum and anodized with a matte black finish. It is compatible with M-LOK style rails, shrouds, and hand guards. This angled foregrip provides a very comfortable, forward grip...

    $19.97
  • Magpul® MOE® AR-15 Build Kit Magpul® MOE® AR-15 Build Kit 2 Magpul® MOE® AR-15 Build Kit 3 Magpul® MOE® AR-15 Build Kit 9 Magpul® MOE® AR-15 Build Kit 6

    Magpul® MOE® AR-15 Lower Build Kit

    Once you've grabbed a stripped lower or 80% lower (sold separately) you'll need a parts kit like this one. It provides the internals for your receiver, making it functional. In addition to its mil-spec parts, this kit includes upgraded Magpul®...

    $134.99
36 of 143 Items

Quality AR parts kits, triggers, receivers, handguards, BCGs, and AR-15 accessories.

Welcome to the parts counter. Ready to build a truly custom AR-15 from scratch? It's all here: Upper parts, lower parts, rail attachments, grips, handguards -- you name it, we've got it.

Need help picking parts? Start with our Builder's Master Guide

AR Lower Parts: What's in a Receiver?

We've sourced quality, mil-spec lower receiver internals and components so you can complete your AR-15 build with confidence backed by guaranteed compatibility. The AR lower parts assembly includes the following:

  • Stripped lower receiver, or fabricated 80% Lower
  • Lower parts kit
  • Buffer tube
  • Buffer and recoil spring
  • Pistol grip
  • Castle nut
  • Latch plate

Grips, castle nuts, and latch plates are typically included in the lower parts kit. An upgraded latch plate (like this Magpul ASAP QD plate) includes a QD sling stud mount for easy carrying. An upgraded drop-in or "cassette" trigger (like this JMT Single Stage) provides a better trigger pull with less weight and faster, smoother resets for improved accuracy.

Ready to assemble? Here's how to install your lower parts kit.

Not sure what parts you need? Check out our full lower assemblies!

AR Upper Parts: Everything You Need

Your finished AR upper is the "business end" of your rifle or pistol: It's responsible for chambering and firing live rounds. So, you're going to want the highest-quality parts for reliability and accuracy. That means investing in a 4150 CMV barrel, an M16-type bolt carrier group, and a forged M4-type upper receiver. We've got all those components available at great prices.

Want to make it even easier? We've got tons of barreled upper assemblies, pre-built with a bolt included, ready for install. Options are available for .308, 6.5 Creedmoor, .223 Wylde, 300 Blackout, and 9mm, and of course, 5.56 NATO.

Here's how to install the AR-15's barrel, gas system, and handguard.

Grab Your Gunsmithing Tools, Too!

Ever try to install an LPK without punches? You probably wound up losing some of those tiny roll pins, halting your build. Get rid of the frustration and guesswork and grab the tools you need to confidently attack your 80% project. We've got quality Armorer's Wrenches, torque wrenches, roll pin kits, vise blocks, and all the other gunsmithing tools you need to go from a hunk or aluminum or polymer to a locked n' loaded shooter. Grab a complete Armorers Kit like the Wheeler set, and you'll have virtually all the tools required.

 


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DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At 80-Lower.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.